| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.yarn.conf; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.yarn.exceptions.YarnException; |
| |
| @Private |
| @Unstable |
| /** |
| * Base class to implement ConfigurationProvider. |
| * Real ConfigurationProvider implementations need to derive from it and |
| * implement load methods to actually load the configuration. |
| */ |
| public abstract class ConfigurationProvider { |
| |
| public void init(Configuration bootstrapConf) throws Exception { |
| initInternal(bootstrapConf); |
| } |
| |
| public void close() throws Exception { |
| closeInternal(); |
| } |
| |
| /** |
| * Opens an InputStream at the indicated file |
| * @param bootstrapConf Configuration |
| * @param name The configuration file name |
| * @return configuration |
| * @throws YarnException |
| * @throws IOException |
| */ |
| public abstract InputStream getConfigurationInputStream( |
| Configuration bootstrapConf, String name) throws YarnException, |
| IOException; |
| |
| /** |
| * Derived classes initialize themselves using this method. |
| */ |
| public abstract void initInternal(Configuration bootstrapConf) |
| throws Exception; |
| |
| /** |
| * Derived classes close themselves using this method. |
| */ |
| public abstract void closeInternal() throws Exception; |
| } |